Bag Semantics Conjunctive Query Containment. Four Small Steps Towards Undecidability.
Summary: Bag-semantics conjunctive query containment, advancing beyond set-based results in QCP_CQ. Four small steps toward undecidability show generalized bag-QCP_CQ is undecidable; for boolean CQs phi_s, phi_b and a linear F, deciding F(phi_s(D)) <= phi_b(D) for all databases D is undecidable. (summarized by gpt-5-nano on Feb 09 2026)
Incoming Non-self Citations Over Time
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Incoming Citations (Sorted by Pagerank)
Showing 2 of 2 citing papers.
| Rank | Citing Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 10,002 | Bag Semantics Query Containment: The CQ vs. UCQ Case and Other Stories | 2026 | PODS | 4.1945683e-05 |
| 10,649 | STsCache: An Efficient Semantic Caching Scheme for Time-series Data Workloads Based on Hybrid Storage | 2025 | VLDB | 4.1945683e-05 |
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Outgoing Citations (Sorted by Pagerank)
Showing 6 of 6 cited papers.
Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.
| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 335 | Optimization of Real Conjunctive Queries | 1993 | PODS | 0.00027036073 |
| 1,522 | The Containment Problem for Real Conjunctive Queries with Inequalities | 2006 | PODS | 0.0001153051 |
| 3,307 | Attacking Diophantus: Solving a Special Case of Bag Containment | 2019 | PODS | 7.2431594e-05 |
| 3,775 | Bag Query Containment and Information Theory | 2020 | PODS | 6.775636e-05 |
| 6,274 | Classification of Annotation Semirings over Query Containment | 2012 | PODS | 5.1321227e-05 |
| 6,275 | Determinacy of Real Conjunctive Queries. The Boolean Case | 2022 | PODS | 5.1319495e-05 |
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Semantically Similar Papers
| Overall Rank | Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 3,307 | Attacking Diophantus: Solving a Special Case of Bag Containment | 2019 | PODS | 7.2431594e-05 |
| 12,297 | Equivalence of SQL Queries In Presence of Embedded Dependencies | 2009 | PODS | 4.1945683e-05 |
| 5,195 | Equivalence of Queries Combining Set and Bag-Set Semantics | 2006 | PODS | 5.6366303e-05 |
| 1,490 | On the Decidability of Query Containment under Constraints | 1998 | PODS | 0.00011699154 |
| 335 | Optimization of Real Conjunctive Queries | 1993 | PODS | 0.00027036073 |
| 11,829 | Semantic Acyclicity Under Constraints | 2016 | PODS | 4.1945683e-05 |
| 3,775 | Bag Query Containment and Information Theory | 2020 | PODS | 6.775636e-05 |
| 1,522 | The Containment Problem for Real Conjunctive Queries with Inequalities | 2006 | PODS | 0.0001153051 |
| 6,275 | Determinacy of Real Conjunctive Queries. The Boolean Case | 2022 | PODS | 5.1319495e-05 |
| 10,002 | Bag Semantics Query Containment: The CQ vs. UCQ Case and Other Stories | 2026 | PODS | 4.1945683e-05 |